High Frequency Direction Finding System for strategic intelligence collection and emitter location. HF-DF, (popularly known as huff-duff) intercepts and locates voice and message traffic transmitted on short-wave channels. HF-DF systems operate at frequencies where the signals are reflected from the earth's ionosphere [skywave signals].

Similar to "Classic Bullseye" system in the US.
View in Google Earth Categories: Military - Communications
Links: fas.org
By: kjfitz
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